You can place orders over the phone with your broker but if you have no internet then you can’t get a price feed and therefore no charts are available for analysis. So, unless you can dial in via a modem and access your brokers price feed that way, essentially, you can’t trade.

I once did a bit of trading without charts but I wouldn’t recommend it. This was buying stocks that were rising long-term on the day their results were released. I noted their closing price the day before and then phoned the broker after about 15-30 minutes of trading the next morning. If price was up I bought and then re-checked the price every half hour or so. The exit signal would be if price fell below the prior day’s close. I closed at around lunch-time. At least two times I recall the share price made +15-20% by midday.

Yep, sort of end of the world scenario or something like that, old fashioned way really via phone or similar way. How else we can go with everything else. I do not really recommend that way to be there. I do not really see that all happening. Better not to think about it.

I have, personally, had to call my broker on the phone during power outages. It was one of the things that taught me to both always use a stop loss and be with a broker that has custom support through phone calls and not just online chat.